linux-kernel - Re: [PATCH 02/13] sched_ext: Make slice values tunable and use shorter slice in bypass mode

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Message-ID: <aRGgtBUWV9VtKctq@gpd4>
Date: Mon, 10 Nov 2025 09:22:12 +0100
From: Andrea Righi <andrea.righi@...ux.dev>
To: Tejun Heo <tj@...nel.org>
Cc: David Vernet <void@...ifault.com>, Changwoo Min <changwoo@...lia.com>,
	Dan Schatzberg <schatzberg.dan@...il.com>,
	Emil Tsalapatis <etsal@...a.com>, sched-ext@...ts.linux.dev,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 02/13] sched_ext: Make slice values tunable and use
 shorter slice in bypass mode

Hi Tejun,

On Sun, Nov 09, 2025 at 08:31:01AM -1000, Tejun Heo wrote:
...
> +	/*
> +	 * %SCX_SLICE_DFL is used to refill slices when the BPF scheduler misses
> +	 * to set the slice for a task that is selected for execution.
> +	 * %SCX_EV_REFILL_SLICE_DFL counts the number of times the default slice
> +	 * refill has been triggered.
> +	 *
> +	 * %SCX_SLICE_BYPASS is used as the slice for all tasks in the bypass
> +	 * mode. As mkaing forward progress for all tasks is the main goal of

Small typo: s/mkaing/making/

-Andrea

> +	 * the bypass mode, a shorter slice is used.
> +	 */
>  	SCX_SLICE_DFL		= 20 * 1000000,	/* 20ms */
> +	SCX_SLICE_BYPASS	=  5 * 1000000, /*  5ms */
>  	SCX_SLICE_INF		= U64_MAX,	/* infinite, implies nohz */
>  };
>